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The first stable product of the C3 (Calvin) pathway is
AGlucose (a 6-carbon compound)
B3-PGA (a 3-carbon compound)
COAA (a 4-carbon compound)
DPEP (a 3-carbon compound)
Answer & Solution
Correct answer: B. 3-PGA (a 3-carbon compound)
3-Phosphoglyceric acid (3-PGA, three carbons) is the first stable product of the Calvin cycle. In C4 plants the first stable product is OAA (four carbons), but the Calvin cycle still occurs downstream.
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